Functional monitoring system, in particular access control...

Details Functional monitoring system, in particular access control... Functional monitoring system, in particular access control...

2005-03-15

2005-03-15

Zimmerman, Brian (Department: 2635)

Communications: electrical

Selective

Interrogation response

C340S005200, C340S005610, C340S005720, C340S010200

Reexamination Certificate

active

06867686

ABSTRACT:
The transmitting and receiving station generates a interrogation code signal which is identical for all of the transponders. All of the transponders that receive the signal answer simultaneously at the same carrier frequency. In order to avoid signal collisions, the transponders are synchronized before and/or during the transmission of the response signals. As an alternative, each transponder is assigned a dedicated subcarrier frequency in addition to the main carrier frequency, which is the same for all of the transponders.

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